UUIDv7 vs UUIDv4

UUIDv7 eliminates B-tree index fragmentation in PostgreSQL and MySQL through sequential timestamps, while UUIDv4 hides creation time completely.

UUIDv7

RFC 9562 time-ordered 128-bit identifier combining a 48-bit Unix millisecond prefix with 74 bits of CSPRNG entropy.

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UUIDv4

RFC 9562 purely random 128-bit identifier providing 122 bits of CSPRNG unpredictability with zero timestamp leakage.

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Feature Comparison

FeatureUUIDv7UUIDv4Password, Passphrase, UUIDv7/ULID & Keygen Studio
Database B-tree localityMonotonic append-friendlyRandom page splitsGenerate UUIDv7 & ULID
Timestamp privacyEmbeds creation millisecondZero timestamp metadataGenerate CSPRNG UUIDv4
Wire compatibilityStandard 36-char UUIDStandard 36-char UUIDBatch export & inspect

Verdict

Use UUIDv7 for primary database keys and high-write event tables; choose UUIDv4 for capability URLs, reset tokens, or IDs where creation timestamps must stay hidden.

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Frequently Asked Questions

What is the difference between UUIDv7 and UUIDv4?

UUIDv7 eliminates B-tree index fragmentation in PostgreSQL and MySQL through sequential timestamps, while UUIDv4 hides creation time completely. On the points that matter most: Database B-tree locality — UUIDv7: Monotonic append-friendly; UUIDv4: Random page splits. Timestamp privacy — UUIDv7: Embeds creation millisecond; UUIDv4: Zero timestamp metadata. Wire compatibility — UUIDv7: Standard 36-char UUID; UUIDv4: Standard 36-char UUID.

Is UUIDv7 better than UUIDv4?

Use UUIDv7 for primary database keys and high-write event tables; choose UUIDv4 for capability URLs, reset tokens, or IDs where creation timestamps must stay hidden. If you mainly need the core feature without a subscription or signup, Password, Passphrase, UUIDv7/ULID & Keygen Studio is a free alternative to both.

Is there a free alternative to both UUIDv7 and UUIDv4?

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