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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":596,"path":597,"stem":598,"icon":572},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":600,"path":601,"stem":602,"icon":572},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":604,"path":605,"stem":606,"icon":572},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":609,"body":610,"description":1403,"extension":1404,"links":1405,"meta":1410,"navigation":1411,"path":579,"seo":1412,"stem":580,"__hash__":1413},"docs\u002F7.reference\u002F7.cost.md","Log cost",{"type":611,"value":612,"toc":1395},"minimark",[613,617,620,625,628,632,639,1157,1218,1249,1259,1263,1266,1315,1318,1321,1325,1328,1334,1337,1341,1348,1356,1367,1371,1391],[614,615,616],"p",{},"Log bills scale with what you send, and a logger that writes a line per step sends the same request context over and over. Every line carries its own level, timestamp, host, and request bindings. Four lines, four copies.",[614,618,619],{},"evlog emits one event per request instead, so that context is written once. This page measures the difference and lets you price it against your own traffic.",[621,622,624],"h2",{"id":623},"try-it-against-your-numbers","Try it against your numbers",[626,627],"log-cost-calculator",{},[621,629,631],{"id":630},"where-the-byte-counts-come-from","Where the byte counts come from",[614,633,634,635,638],{},"Both shapes are the checkout request documented on ",[636,637,388],"a",{"href":557},", serialized through the real libraries rather than estimated.",[640,641,642,910],"code-group",{},[643,644,650],"pre",{"className":645,"code":646,"filename":647,"language":648,"meta":649,"style":649},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const log = createLogger({ method: 'POST', path: '\u002Fapi\u002Fcheckout', requestId: 'req_abc' })\nlog.set({ user: { id: 'usr_123', plan: 'pro' } })\nlog.set({ cart: { items: 3, total: 9999 } })\nlog.set({ payment: { method: 'card', last4: '4242' } })\nlog.emit({ status: 200 })\n","evlog, 1 event of 322 B","typescript","",[651,652,653,732,788,833,884],"code",{"__ignoreMap":649},[654,655,658,662,666,670,674,677,680,684,687,690,694,697,700,703,705,707,710,712,714,717,719,721,724,726,729],"span",{"class":656,"line":657},"line",1,[654,659,661],{"class":660},"spNyl","const",[654,663,665],{"class":664},"sTEyZ"," log ",[654,667,669],{"class":668},"sMK4o","=",[654,671,673],{"class":672},"s2Zo4"," createLogger",[654,675,676],{"class":664},"(",[654,678,679],{"class":668},"{",[654,681,683],{"class":682},"swJcz"," method",[654,685,686],{"class":668},":",[654,688,689],{"class":668}," '",[654,691,693],{"class":692},"sfazB","POST",[654,695,696],{"class":668},"'",[654,698,699],{"class":668},",",[654,701,702],{"class":682}," path",[654,704,686],{"class":668},[654,706,689],{"class":668},[654,708,709],{"class":692},"\u002Fapi\u002Fcheckout",[654,711,696],{"class":668},[654,713,699],{"class":668},[654,715,716],{"class":682}," requestId",[654,718,686],{"class":668},[654,720,689],{"class":668},[654,722,723],{"class":692},"req_abc",[654,725,696],{"class":668},[654,727,728],{"class":668}," }",[654,730,731],{"class":664},")\n",[654,733,735,738,741,744,746,748,751,753,756,759,761,763,766,768,770,773,775,777,780,782,784,786],{"class":656,"line":734},2,[654,736,737],{"class":664},"log",[654,739,740],{"class":668},".",[654,742,743],{"class":672},"set",[654,745,676],{"class":664},[654,747,679],{"class":668},[654,749,750],{"class":682}," user",[654,752,686],{"class":668},[654,754,755],{"class":668}," {",[654,757,758],{"class":682}," id",[654,760,686],{"class":668},[654,762,689],{"class":668},[654,764,765],{"class":692},"usr_123",[654,767,696],{"class":668},[654,769,699],{"class":668},[654,771,772],{"class":682}," plan",[654,774,686],{"class":668},[654,776,689],{"class":668},[654,778,779],{"class":692},"pro",[654,781,696],{"class":668},[654,783,728],{"class":668},[654,785,728],{"class":668},[654,787,731],{"class":664},[654,789,791,793,795,797,799,801,804,806,808,811,813,817,819,822,824,827,829,831],{"class":656,"line":790},3,[654,792,737],{"class":664},[654,794,740],{"class":668},[654,796,743],{"class":672},[654,798,676],{"class":664},[654,800,679],{"class":668},[654,802,803],{"class":682}," cart",[654,805,686],{"class":668},[654,807,755],{"class":668},[654,809,810],{"class":682}," items",[654,812,686],{"class":668},[654,814,816],{"class":815},"sbssI"," 3",[654,818,699],{"class":668},[654,820,821],{"class":682}," total",[654,823,686],{"class":668},[654,825,826],{"class":815}," 9999",[654,828,728],{"class":668},[654,830,728],{"class":668},[654,832,731],{"class":664},[654,834,836,838,840,842,844,846,849,851,853,855,857,859,862,864,866,869,871,873,876,878,880,882],{"class":656,"line":835},4,[654,837,737],{"class":664},[654,839,740],{"class":668},[654,841,743],{"class":672},[654,843,676],{"class":664},[654,845,679],{"class":668},[654,847,848],{"class":682}," payment",[654,850,686],{"class":668},[654,852,755],{"class":668},[654,854,683],{"class":682},[654,856,686],{"class":668},[654,858,689],{"class":668},[654,860,861],{"class":692},"card",[654,863,696],{"class":668},[654,865,699],{"class":668},[654,867,868],{"class":682}," last4",[654,870,686],{"class":668},[654,872,689],{"class":668},[654,874,875],{"class":692},"4242",[654,877,696],{"class":668},[654,879,728],{"class":668},[654,881,728],{"class":668},[654,883,731],{"class":664},[654,885,887,889,891,894,896,898,901,903,906,908],{"class":656,"line":886},5,[654,888,737],{"class":664},[654,890,740],{"class":668},[654,892,893],{"class":672},"emit",[654,895,676],{"class":664},[654,897,679],{"class":668},[654,899,900],{"class":682}," status",[654,902,686],{"class":668},[654,904,905],{"class":815}," 200",[654,907,728],{"class":668},[654,909,731],{"class":664},[643,911,914],{"className":645,"code":912,"filename":913,"language":648,"meta":649,"style":649},"const child = pinoLogger.child({ method: 'POST', path: '\u002Fapi\u002Fcheckout', requestId: 'req_abc' })\nchild.info({ user: { id: 'usr_123', plan: 'pro' } }, 'user context')\nchild.info({ cart: { items: 3, total: 9999 } }, 'cart context')\nchild.info({ payment: { method: 'card', last4: '4242' } }, 'payment context')\nchild.info({ status: 200 }, 'request complete')\n","pino, 4 lines of 736 B",[651,915,916,975,1030,1075,1128],{"__ignoreMap":649},[654,917,918,920,923,925,928,930,933,935,937,939,941,943,945,947,949,951,953,955,957,959,961,963,965,967,969,971,973],{"class":656,"line":657},[654,919,661],{"class":660},[654,921,922],{"class":664}," child ",[654,924,669],{"class":668},[654,926,927],{"class":664}," 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},",[654,1022,689],{"class":668},[654,1024,1025],{"class":692},"user context",[654,1027,696],{"class":668},[654,1029,731],{"class":664},[654,1031,1032,1034,1036,1038,1040,1042,1044,1046,1048,1050,1052,1054,1056,1058,1060,1062,1064,1066,1068,1071,1073],{"class":656,"line":790},[654,1033,932],{"class":664},[654,1035,740],{"class":668},[654,1037,983],{"class":672},[654,1039,676],{"class":664},[654,1041,679],{"class":668},[654,1043,803],{"class":682},[654,1045,686],{"class":668},[654,1047,755],{"class":668},[654,1049,810],{"class":682},[654,1051,686],{"class":668},[654,1053,816],{"class":815},[654,1055,699],{"class":668},[654,1057,821],{"class":682},[654,1059,686],{"class":668},[654,1061,826],{"class":815},[654,1063,728],{"class":668},[654,1065,1020],{"class":668},[654,1067,689],{"class":668},[654,1069,1070],{"class":692},"cart context",[654,1072,696],{"class":668},[654,1074,731],{"class":664},[654,1076,1077,1079,1081,1083,1085,1087,1089,1091,1093,1095,1097,1099,1101,1103,1105,1107,1109,1111,1113,1115,1117,1119,1121,1124,1126],{"class":656,"line":835},[654,1078,932],{"class":664},[654,1080,740],{"class":668},[654,1082,983],{"class":672},[654,1084,676],{"class":664},[654,1086,679],{"class":668},[654,1088,848],{"class":682},[654,1090,686],{"class":668},[654,1092,755],{"class":668},[654,1094,683],{"class":682},[654,1096,686],{"class":668},[654,1098,689],{"class":668},[654,1100,861],{"class":692},[654,1102,696],{"class":668},[654,1104,699],{"class":668},[654,1106,868],{"class":682},[654,1108,686],{"class":668},[654,1110,689],{"class":668},[654,1112,875],{"class":692},[654,1114,696],{"class":668},[654,1116,728],{"class":668},[654,1118,1020],{"class":668},[654,1120,689],{"class":668},[654,1122,1123],{"class":692},"payment context",[654,1125,696],{"class":668},[654,1127,731],{"class":664},[654,1129,1130,1132,1134,1136,1138,1140,1142,1144,1146,1148,1150,1153,1155],{"class":656,"line":886},[654,1131,932],{"class":664},[654,1133,740],{"class":668},[654,1135,983],{"class":672},[654,1137,676],{"class":664},[654,1139,679],{"class":668},[654,1141,900],{"class":682},[654,1143,686],{"class":668},[654,1145,905],{"class":815},[654,1147,1020],{"class":668},[654,1149,689],{"class":668},[654,1151,1152],{"class":692},"request complete",[654,1154,696],{"class":668},[654,1156,731],{"class":664},[1158,1159,1160,1176],"table",{},[1161,1162,1163],"thead",{},[1164,1165,1166,1169,1173],"tr",{},[1167,1168],"th",{},[1167,1170,1172],{"align":1171},"right","Events",[1167,1174,1175],{"align":1171},"Bytes",[1177,1178,1179,1191,1202],"tbody",{},[1164,1180,1181,1185,1188],{},[1182,1183,1184],"td",{},"pino, 4 lines",[1182,1186,1187],{"align":1171},"4",[1182,1189,1190],{"align":1171},"736",[1164,1192,1193,1196,1199],{},[1182,1194,1195],{},"evlog, 1 event",[1182,1197,1198],{"align":1171},"1",[1182,1200,1201],{"align":1171},"322",[1164,1203,1204,1207,1213],{},[1182,1205,1206],{},"Difference",[1182,1208,1209],{"align":1171},[1210,1211,1212],"strong",{},"75% fewer",[1182,1214,1215],{"align":1171},[1210,1216,1217],{},"56% fewer",[614,1219,1220,1221,1224,1225,1224,1228,1224,1231,1224,1234,1224,1237,1240,1241,1244,1245,1248],{},"The two numbers differ because consolidation removes duplicated envelope, not payload. ",[651,1222,1223],{},"level",", ",[651,1226,1227],{},"time",[651,1229,1230],{},"pid",[651,1232,1233],{},"hostname",[651,1235,1236],{},"method",[651,1238,1239],{},"path",", and ",[651,1242,1243],{},"requestId"," are written four times by pino and once by evlog, and the four ",[651,1246,1247],{},"msg"," strings disappear entirely. The fields you actually set are written once either way.",[1250,1251,1254,1255,1258],"callout",{"color":1252,"icon":1253},"warning","i-lucide-alert-triangle","Your ratio is not this ratio. A handler that logs two lines saves less; one that repeats a large ",[651,1256,1257],{},"user"," object on every line saves more. The method transfers, the number does not.",[621,1260,1262],{"id":1261},"which-number-moves-your-bill","Which number moves your bill",[614,1264,1265],{},"Providers meter logs in one of two ways, and that decides which saving you actually collect.",[1158,1267,1268,1281],{},[1161,1269,1270],{},[1164,1271,1272,1275,1278],{},[1167,1273,1274],{},"Metered by",[1167,1276,1277],{},"Saving you collect",[1167,1279,1280],{},"Providers",[1177,1282,1283,1298],{},[1164,1284,1285,1288,1295],{},[1182,1286,1287],{},"Gigabytes ingested",[1182,1289,1290,1291,1294],{},"The ",[1210,1292,1293],{},"56%"," byte figure",[1182,1296,1297],{},"Grafana Cloud, Sentry, PostHog, Better Stack, Axiom",[1164,1299,1300,1307,1313],{},[1182,1301,1302,1303,1306],{},"Gigabytes ",[1210,1304,1305],{},"and"," indexed events",[1182,1308,1290,1309,1312],{},[1210,1310,1311],{},"75%"," event figure, on the line item that usually dominates",[1182,1314,186],{},[614,1316,1317],{},"Per-gigabyte billing is the common case, so most teams collect the byte saving. Datadog is the outlier worth checking: it bills ingestion per gigabyte and indexing per million events, and at production volumes the indexing line is the larger of the two, so the event count is what moves.",[614,1319,1320],{},"Rates were read on 14 August 2026 and are list prices, before free tiers, committed-use discounts, and retention add-ons. They are inputs in the calculator above for exactly that reason.",[621,1322,1324],{"id":1323},"sampling-moves-both-columns","Sampling moves both columns",[614,1326,1327],{},"The calculator applies sampling to both shapes, which is the only fair way to model it. Dropping events is not something evlog does and other loggers cannot: you can filter by level in any logger, or sample in the transport. Applying it to one side only would flatter evlog with a saving that is not evlog's. Pull the slider down and both bills fall together while the gap between them holds.",[614,1329,1330,1331,1333],{},"It is still the larger lever. Consolidation is bounded, because you cannot send fewer than one event per request. ",[636,1332,66],{"href":67}," is not: head sampling drops events by level at emit time, and tail sampling force-keeps the ones you would have wanted, so errors and slow requests survive a rule that discards the rest. Volume stops tracking traffic and starts tracking signal, which is the only version of this that keeps working as you grow.",[614,1335,1336],{},"What evlog changes is the unit sampling operates on. Dropping a line loses part of a request; dropping an event loses a whole one, and keeping an event keeps all of it.",[621,1338,1340],{"id":1339},"ask-it-from-your-editor","Ask it from your editor",[614,1342,1343,1344,1347],{},"The same calculation is an MCP tool on this site's server, so an assistant connected to ",[651,1345,1346],{},"https:\u002F\u002Fevlog.dev\u002Fmcp"," can answer it directly:",[643,1349,1354],{"className":1350,"code":1352,"language":1353},[1351],"language-text","estimate-log-cost({ requestsPerMonth: 10000000, linesPerRequest: 4, provider: \"datadog\" })\n","text",[651,1355,1352],{"__ignoreMap":649},[614,1357,1358,1359,1362,1363,1366],{},"It returns both shapes, the saving, and the basis it used: the measured byte counts, which rates it applied, and the date those rates were read. Pass ",[651,1360,1361],{},"perGb"," and ",[651,1364,1365],{},"perMillionIndexed"," to price a provider that is not in the list, or to correct one whose pricing has moved.",[621,1368,1370],{"id":1369},"next","Next",[1372,1373,1374,1380,1385],"ul",{},[1375,1376,1377,1379],"li",{},[636,1378,66],{"href":67},": the two tiers, and what each one costs you in visibility",[1375,1381,1382,1384],{},[636,1383,388],{"href":557},": the benchmarks these byte counts come from",[1375,1386,1387,1390],{},[636,1388,1389],{"href":158},"Drain adapters",": every destination, and how to change your mind later",[1392,1393,1394],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":649,"searchDepth":734,"depth":734,"links":1396},[1397,1398,1399,1400,1401,1402],{"id":623,"depth":734,"text":624},{"id":630,"depth":734,"text":631},{"id":1261,"depth":734,"text":1262},{"id":1323,"depth":734,"text":1324},{"id":1339,"depth":734,"text":1340},{"id":1369,"depth":734,"text":1370},"One request leaves one event instead of four lines: 56% fewer bytes, 75% fewer events. Which number moves your bill depends on your provider.","md",[1406,1409],{"label":388,"icon":117,"to":557,"color":1407,"variant":1408},"neutral","subtle",{"label":66,"icon":69,"to":67,"color":1407,"variant":1408},{},{"title":578,"icon":581},{"title":609,"description":1403},"w2zIB3Tb0pcig-UrCNo5CGO0unYGjQpcMHLEkXmcDI8",[1415,1417],{"title":574,"path":575,"stem":576,"description":1416,"icon":448,"children":-1},"AI-assisted code review and evlog adoption using Agent Skills. Let AI review your logging patterns and guide migration to wide events.",{"title":588,"path":589,"stem":590,"description":1418,"icon":572,"children":-1},"Compare request context, serializers, transports, and migration costs before moving a Pino application to evlog.",1791240203488]