AI Index / AI tools for lawyers / History

AI tools for lawyers — AI Recommendation History

What AI assistants recommended for ai tools for lawyers, date by date. Every ranking we publish is frozen the day it publishes, so this is a record of what was said — not a re-computation of what today's data would say about the past.

Record: 26 dated snapshots · Aug 14, 2026 – Sep 8, 2026

Answer archive Methodology Data studies JSON

What changed

Computed by comparing each dated snapshot with the one before it. Share moves smaller than 1pp are treated as noise and left out — the same threshold that suppresses trend arrows on the ranking.

Sep 8, 2026vs Sep 7, 2026

No change above the noise floor.

Sep 7, 2026vs Sep 6, 2026

No change above the noise floor.

Sep 6, 2026vs Sep 5, 2026

Methodology change: extraction rules 4-7 → 7 between these dates. Differences below may reflect the rule change rather than a change in what AI recommends — see the methodology changelog.

▲ INVincent AI entered the top 10 (#11 → #7)
▲ INLuminance entered the top 10 (#13 → #10)
▼ OUTClio left the top 10 (#8 → #14)
▼ OUTLegalOn left the top 10 (#10 → #11)
▼Clio moved #8 → #14
▲Vincent AI moved #11 → #7
▲Luminance moved #13 → #10
▼Protégé moved #7 → #9
▲vLex moved #9 → #8
▼LegalOn moved #10 → #11
▼Harvey -6.7pp (60.3% → 53.6%)
▼Lexis+ -6.7pp (46% → 39.3%)
▼Clio -6.7pp (31.7% → 25%)
▲Vincent AI +5.1pp (27% → 32.1%)
▲Luminance +4.8pp (23.8% → 28.6%)
▼CoCounsel -4.4pp (50.8% → 46.4%)
▲vLex +3.5pp (28.6% → 32.1%)
▼Protégé -3.1pp (31.7% → 28.6%)
▲Westlaw +2.8pp (50.8% → 53.6%)
▼Microsoft -2pp (55.6% → 53.6%)

Sep 5, 2026vs Sep 4, 2026

No change above the noise floor.

Sep 4, 2026vs Sep 3, 2026

No change above the noise floor.

Sep 3, 2026vs Sep 2, 2026

No change above the noise floor.

Sep 2, 2026vs Sep 1, 2026

No change above the noise floor.

Sep 1, 2026vs Aug 31, 2026

No change above the noise floor.

Aug 31, 2026vs Aug 30, 2026

No change above the noise floor.

Aug 30, 2026vs Aug 29, 2026

▲Westlaw moved #6 → #4
▼CoCounsel moved #4 → #5
▼Lexis+ moved #5 → #6
▲Protégé moved #8 → #7
▼Clio moved #7 → #8
▼CoCounsel -3.2pp (54% → 50.8%)
▼Lexis+ -3.2pp (49.2% → 46%)
▲Microsoft +1.6pp (54% → 55.6%)
▲Westlaw +1.6pp (49.2% → 50.8%)
▼Clio -1.6pp (33.3% → 31.7%)
▲Protégé +1.5pp (30.2% → 31.7%)

Aug 29, 2026vs Aug 28, 2026

Methodology change: extraction rules 4-5 → 4-7 between these dates. Differences below may reflect the rule change rather than a change in what AI recommends — see the methodology changelog.

▲Protégé moved #10 → #8
▼LegalOn moved #8 → #10
▲Protégé +6pp (24.2% → 30.2%)
▼Harvey -4.2pp (64.5% → 60.3%)
▲Westlaw +4pp (45.2% → 49.2%)
▼LegalOn -2pp (30.6% → 28.6%)
▲Clio +1pp (32.3% → 33.3%)

Aug 28, 2026vs Aug 27, 2026

No change above the noise floor.

Aug 27, 2026vs Aug 26, 2026

No change above the noise floor.

Aug 26, 2026vs Aug 25, 2026

No change above the noise floor.

Aug 25, 2026vs Aug 24, 2026

No change above the noise floor.

Aug 24, 2026vs Aug 23, 2026

▲ INProtégé entered the top 10 (#13 → #10)
▼ OUTPaxton left the top 10 (#10 → #11)
▲Protégé moved #13 → #10
▼Paxton moved #10 → #11
▲Westlaw +4.4pp (40.8% → 45.2%)
▲Lexis+ +2.6pp (47.4% → 50%)
▲CoCounsel +1.9pp (51.3% → 53.2%)
▼Microsoft -1.8pp (56.6% → 54.8%)
▼Spellbook -1.3pp (65.8% → 64.5%)

Aug 23, 2026vs Aug 22, 2026

No change above the noise floor.

Aug 22, 2026vs Aug 21, 2026

▲Clio moved #9 → #7
▲Spellbook moved #2 → #1
▼Harvey moved #1 → #2
▼LegalOn moved #7 → #8
▼vLex moved #8 → #9
▲Clio +2.7pp (28.9% → 31.6%)
▲Spellbook +1.9pp (63.9% → 65.8%)
▼Westlaw -1.4pp (42.2% → 40.8%)
▲LegalOn +1.4pp (28.9% → 30.3%)
▲Microsoft +1.2pp (55.4% → 56.6%)

Aug 21, 2026vs Aug 20, 2026

No change above the noise floor.

Aug 20, 2026vs Aug 19, 2026

▲ INPaxton entered the top 10 (#11 → #10)
▼ OUTVincent AI left the top 10 (#10 → #11)
▼Clio moved #7 → #9
▲Harvey moved #2 → #1
▼Spellbook moved #1 → #2
▲LegalOn moved #8 → #7
▲vLex moved #9 → #8
▲Paxton moved #11 → #10
▼Vincent AI moved #10 → #11
▼CoCounsel -1.8pp (53.6% → 51.8%)
▼Lexis+ -1.5pp (48.5% → 47%)
▼Microsoft -1.3pp (56.7% → 55.4%)
▲Harvey +1.2pp (63.9% → 65.1%)
▼Westlaw -1.1pp (43.3% → 42.2%)
▼Spellbook -1pp (64.9% → 63.9%)
▼Clio -1pp (29.9% → 28.9%)

Aug 19, 2026vs Aug 18, 2026

No change above the noise floor.

Aug 18, 2026vs Aug 17, 2026

No change above the noise floor.

Aug 17, 2026vs Aug 16, 2026

No change above the noise floor.

Aug 16, 2026vs Aug 15, 2026

No change above the noise floor.

Aug 15, 2026vs Aug 14, 2026

No change above the noise floor.

The ranking, date by date

Top 10 on each archived date, exactly as published. Cite a date and it stays true: snapshots are append-only, and a correction appends a new revision rather than overwriting the original.

Sep 8, 202628 sampled answers · window 2026-08-11 – 2026-09-08 · rules v7

#1Spellbook64.3%
#2Harvey53.6%
#3Microsoft53.6%
#4Westlaw53.6%
#5CoCounsel46.4%
#6Lexis+39.3%
#7Vincent AI32.1%
#8vLex32.1%
#9Protégé28.6%
#10Luminance28.6%

Sep 7, 202628 sampled answers · window 2026-08-10 – 2026-09-07 · rules v7

#1Spellbook64.3%
#2Harvey53.6%
#3Microsoft53.6%
#4Westlaw53.6%
#5CoCounsel46.4%
#6Lexis+39.3%
#7Vincent AI32.1%
#8vLex32.1%
#9Protégé28.6%
#10Luminance28.6%

Sep 6, 202628 sampled answers · window 2026-08-09 – 2026-09-06 · rules v7

#1Spellbook64.3%
#2Harvey53.6%
#3Microsoft53.6%
#4Westlaw53.6%
#5CoCounsel46.4%
#6Lexis+39.3%
#7Vincent AI32.1%
#8vLex32.1%
#9Protégé28.6%
#10Luminance28.6%

Sep 5, 202663 sampled answers · window 2026-08-08 – 2026-09-05 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Sep 4, 202663 sampled answers · window 2026-08-07 – 2026-09-04 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Sep 3, 202663 sampled answers · window 2026-08-06 – 2026-09-03 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Sep 2, 202663 sampled answers · window 2026-08-05 – 2026-09-02 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Sep 1, 202663 sampled answers · window 2026-08-04 – 2026-09-01 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Aug 31, 202663 sampled answers · window 2026-08-03 – 2026-08-31 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Aug 30, 202663 sampled answers · window 2026-08-02 – 2026-08-30 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft55.6%
#4Westlaw50.8%
#5CoCounsel50.8%
#6Lexis+46%
#7Protégé31.7%
#8Clio31.7%
#9vLex28.6%
#10LegalOn28.6%

Aug 29, 202663 sampled answers · window 2026-08-01 – 2026-08-29 · rules v4-7

#1Spellbook65.1%
#2Harvey60.3%
#3Microsoft54%
#4CoCounsel54%
#5Lexis+49.2%
#6Westlaw49.2%
#7Clio33.3%
#8Protégé30.2%
#9vLex28.6%
#10LegalOn28.6%

Aug 28, 202662 sampled answers · window 2026-07-31 – 2026-08-28 · rules v4-5

#1Spellbook64.5%
#2Harvey64.5%
#3Microsoft54.8%
#4CoCounsel53.2%
#5Lexis+50%
#6Westlaw45.2%
#7Clio32.3%
#8LegalOn30.6%
#9vLex29%
#10Protégé24.2%

Aug 27, 202662 sampled answers · window 2026-07-30 – 2026-08-27 · rules v4-5

#1Spellbook64.5%
#2Harvey64.5%
#3Microsoft54.8%
#4CoCounsel53.2%
#5Lexis+50%
#6Westlaw45.2%
#7Clio32.3%
#8LegalOn30.6%
#9vLex29%
#10Protégé24.2%

Aug 26, 202662 sampled answers · window 2026-07-29 – 2026-08-26 · rules v4-5

#1Spellbook64.5%
#2Harvey64.5%
#3Microsoft54.8%
#4CoCounsel53.2%
#5Lexis+50%
#6Westlaw45.2%
#7Clio32.3%
#8LegalOn30.6%
#9vLex29%
#10Protégé24.2%

Aug 25, 202662 sampled answers · window 2026-07-28 – 2026-08-25 · rules v4-5

#1Spellbook64.5%
#2Harvey64.5%
#3Microsoft54.8%
#4CoCounsel53.2%
#5Lexis+50%
#6Westlaw45.2%
#7Clio32.3%
#8LegalOn30.6%
#9vLex29%
#10Protégé24.2%

Aug 24, 202662 sampled answers · window 2026-07-27 – 2026-08-24 · rules v4-5

#1Spellbook64.5%
#2Harvey64.5%
#3Microsoft54.8%
#4CoCounsel53.2%
#5Lexis+50%
#6Westlaw45.2%
#7Clio32.3%
#8LegalOn30.6%
#9vLex29%
#10Protégé24.2%

Aug 23, 202676 sampled answers · window 2026-07-26 – 2026-08-23 · rules v4-5

#1Spellbook65.8%
#2Harvey64.5%
#3Microsoft56.6%
#4CoCounsel51.3%
#5Lexis+47.4%
#6Westlaw40.8%
#7Clio31.6%
#8LegalOn30.3%
#9vLex28.9%
#10Paxton25%

Aug 22, 202676 sampled answers · window 2026-07-25 – 2026-08-22 · rules v4-5

#1Spellbook65.8%
#2Harvey64.5%
#3Microsoft56.6%
#4CoCounsel51.3%
#5Lexis+47.4%
#6Westlaw40.8%
#7Clio31.6%
#8LegalOn30.3%
#9vLex28.9%
#10Paxton25%

Aug 21, 202683 sampled answers · window 2026-07-24 – 2026-08-21 · rules v4-5

#1Harvey65.1%
#2Spellbook63.9%
#3Microsoft55.4%
#4CoCounsel51.8%
#5Lexis+47%
#6Westlaw42.2%
#7LegalOn28.9%
#8vLex28.9%
#9Clio28.9%
#10Paxton25.3%

Aug 20, 202683 sampled answers · window 2026-07-23 – 2026-08-20 · rules v4-5

#1Harvey65.1%
#2Spellbook63.9%
#3Microsoft55.4%
#4CoCounsel51.8%
#5Lexis+47%
#6Westlaw42.2%
#7LegalOn28.9%
#8vLex28.9%
#9Clio28.9%
#10Paxton25.3%

Aug 19, 202697 sampled answers · window 2026-07-22 – 2026-08-19 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Aug 18, 202697 sampled answers · window 2026-07-21 – 2026-08-18 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Aug 17, 202697 sampled answers · window 2026-07-20 – 2026-08-17 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Aug 16, 202697 sampled answers · window 2026-07-19 – 2026-08-16 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Aug 15, 202697 sampled answers · window 2026-07-18 – 2026-08-15 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Aug 14, 202697 sampled answers · window 2026-07-17 – 2026-08-14 · rules v4-5

#1Spellbook64.9%
#2Harvey63.9%
#3Microsoft56.7%
#4CoCounsel53.6%
#5Lexis+48.5%
#6Westlaw43.3%
#7Clio29.9%
#8LegalOn28.9%
#9vLex28.9%
#10Vincent AI25.8%

Read any date directly

Every archived date is machine-readable at /api/index/ai-tools-for-lawyers/as-of/<YYYY-MM-DD>, which returns the ranking as it stood, with the extraction version and revision it was published under. Dates before the record begins return no_record rather than a recomputation — we do not reconstruct history on demand and present it as what we said. See what the engines actually said.

[ORBATOR]