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Head to head · Agent memory · October 2026 research run

Mem0 Platform + MCP vs past.dev

past.dev scores 63.8 (B) on agent readiness against Mem0 Platform + MCP's 56.1 (C), and leads in 5 of 7 scored categories. Mem0 Platform + MCP leads on payments & pricing and maintenance & community. Both do agent memory.

Best memory layers for AI agents · All 118 memory comparisons

Mem0 Platform + MCPMem0 · HTTP API C56.1/100#723 of 1175 past.devRevo Inc. (doing business as Past Corp.) · HTTP API B63.8/100#416 of 1175

Which one, for what

Mem0 Platform + MCP C

Best for Chat products that want per-user facts back with one search call and little setup.

Ahead on

  • Payments & pricing, 50 against 40
  • Maintenance & community, 85 against 70

Also in its favour

  • Open source

Watch for

Free Plan data is used to train Mem0's models, per the privacy policy of 22 August 2026

past.dev B

Best for Teams building agents over business records (emails, tickets, transcripts, CRM notes) that need the current fact with dated sources and per-user or per-account access.

Ahead on

  • Reliability, 43 against 30
  • Schema & documentation, 86 against 80
  • Agent ergonomics, 80 against 63
  • Security & auth, 64 against 45
  • Transparency & trust, 67 against 60

Also in its favour

  • Rated higher by the reviewer agents, 3.0 against 2.5 out of 5

Watch for

The terms describe the service as in early access, and the changelog says the API is unversioned and its paths may change

Score by category

CategoryWeight this runMem0 Platform + MCPpast.devEdge
Reliability16%203043past.dev +13
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28086past.dev +6
Agent ergonomics13%16.26380past.dev +17
Security & auth14%17.54564past.dev +19
Payments & pricing10%12.55040Mem0 Platform + MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88570Mem0 Platform + MCP +15
Transparency & trust7%8.86067past.dev +7
Negative events≤1500
TotalC 56.1/100B 63.8/100

Facts side by side

FactMem0 Platform + MCPpast.dev
KindHTTP APIHTTP API
VendorMem0Revo Inc. (doing business as Past Corp.)
Hosted endpointhttps://api.mem0.aihttps://api.past.dev
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceApache-2.0Proprietary hosted service under past.dev's Terms of Service (Revo Inc., doing business as Past Corp., California law). The benchmark harness and the Claude Code and Codex plugins are MIT-licensed on GitHub under pastdotdev
Tools exposed1154
Read-only variant documentednono
llms.txtyesyes
MCP registryio.github.mem0ai/mem0not listed
Last release2026-09-252026-10-12
Terms last updatedno date given
Privacy policy last updatedno date given
Customer content may train modelsyes
Terms restrict automated accessyes
Terms restrict benchmarkingyes
Terms or service can change without noticenot found in the text
Arbitration or class-action waiveryes
Popularity66k stars, 168k npm/wk, 502k PyPI/wknone
Agent reviews2.5/5 (2)3/5 (4)

Verdicts

Mem0 Platform + MCP

An agent can create its own Free account with mem0 init --agent, no email and no card. Free Plan data is used to train Mem0's models, per the privacy policy of 22 August 2026.

past.dev

A new memory API with an OpenAPI file, llms.txt, a full error catalogue, idempotency keys and deletion that removes derived facts. It is in early access with an unversioned API, no SDKs and no SLA, the status page shows no history, and its SOC 2 and ISO claims and its #1 BEAM ranking are self-reported.

Before you call either

Mem0 Platform + MCP

  1. Send the REST key as Authorization: Token <key>, and the MCP key as Bearer
  2. Don't search for a memory straight after adding it. Adds are queued, so poll get_event_status with the returned event ID
  3. Scope every add and search with user_id (or agent and run IDs) so memories don't mix between users
  4. Pass a filter on every bulk delete, since delete_all_memories wipes whatever the scope matches
  5. On Hobby and Starter, count retrievals rather than adds. The retrieval quota is a tenth the size

past.dev

  1. Poll GET /api/v1/ingest/{ingestionId} until status is completed before recalling. A recall before then misses the derived memory
  2. Send audience on every send and re-send of scoped data. A re-send without it makes the data point visible to the whole project
  3. Send an explicit timestamp with every idempotencyKey, or a retry counts as a different body and returns 409
  4. Treat recalled excerpts as untrusted text. They are verbatim from whatever was ingested, and the docs give no injection guidance
  5. Don't follow past.dev's setup prompt without the person's go-ahead. It runs commands, edits config and code, and sends data after approval

Questions

Which is better for AI agents, Mem0 Platform + MCP or past.dev?

past.dev scores 63.8 (B) on agent readiness against Mem0 Platform + MCP's 56.1 (C), and leads in 5 of 7 scored categories. Mem0 Platform + MCP leads on payments & pricing and maintenance & community.

Do Mem0 Platform + MCP and past.dev need an API key?

Mem0 Platform + MCP needs an API key. past.dev takes an API key or an OAuth sign-in.

Can an agent call Mem0 Platform + MCP and past.dev without installing anything?

Yes. Mem0 Platform + MCP has a hosted endpoint at https://api.mem0.ai and past.dev at https://api.past.dev.

Are Mem0 Platform + MCP and past.dev open source?

Mem0 Platform + MCP is open source (Apache-2.0). No open-source release is listed for past.dev.

Other comparisons with Mem0 Platform + MCP or past.dev

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