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Head to head · Assistants reached by message · October 2026 research run

CowAgent vs Tab

CowAgent scores 58.5 (C) on agent readiness against Tab's 10.7 (F), and leads in 6 of 7 scored categories. Both do assistants reached by message.

Best AI personal assistants that act for one person · All 834 assistants comparisons

CowAgentzhayujie · Agent harness C58.5/100#592 of 1010 TabTerrasoft, Inc. · Platform F10.7/100#1003 of 1010

Which one, for what

CowAgent C

Best for One technical owner who wants an assistant on WeChat, Feishu, DingTalk, Telegram, Slack or Discord with memory in local files and a choice of Chinese and Western model providers.

Ahead on

  • Reliability, 84 against 5
  • Schema & documentation, 67 against 0
  • Agent ergonomics, 59 against 0
  • Security & auth, 43 against 4
  • Payments & pricing, 60 against 0
  • Maintenance & community, 83 against 58

Also in its favour

  • Free to start without a card
  • Open source

Watch for

Source and Docker installs default to full-access, and no mode asks the owner before a shell command, a file send or an MCP call

Tab F

Best for A person who wants a texting assistant that browses, calls and buys with tight checkout controls.

Also in its favour

  • No incidents deducted, where CowAgent loses 5 points for them

Watch for

Private beta behind a waitlist.

Score by category

CategoryWeight this runCowAgentTabEdge
Reliability16%20845CowAgent +79
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2670CowAgent +67
Agent ergonomics13%16.2590CowAgent +59
Security & auth14%17.5434CowAgent +39
Payments & pricing10%12.5600CowAgent +60
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88358CowAgent +25
Transparency & trust7%8.84545even
Negative events≤15-50
TotalC 58.5/100F 10.7/100

Facts side by side

FactCowAgentTab
KindAgent harnessPlatform
VendorzhayujieTerrasoft, Inc.
Hosted endpointno (local only)no (local only)
TransportsHTTP
AuthOAuth or keyOAuth or key
PricingFreePaid
x402nono
LicenceMITClosed service under Tab's Terms of Use (Terrasoft, Inc., effective 2 September 2026).
Read-only variant documentedyesno
llms.txtyesno
Last release2026-09-30none
Terms last updatedno document linked
Privacy policy last updatedno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity47k starsnone

Verdicts

CowAgent

MIT software with seven releases in 90 days, memory kept as plain files in the owner's workspace and three per-session permission modes. Source and Docker installs default to full-access, no action asks for approval, and an open report of 31 July 2026 says group members could reach the owner's files through the bot.

Tab

Tab is a private-beta texting assistant with a detailed security page on credential isolation and checkout binding, and a public updates page. No outside agent can call it, no price is published, and its privacy policy says nothing on training with user content.

Before you call either

CowAgent

  1. Set agent_permission_mode to workspace-write or read-only before connecting any channel. Source and Docker installs default to full-access
  2. Keep the bot out of group chats that include other people. Any member who mentions it reaches the same tools as the owner
  3. Set web_password before changing web_host to 0.0.0.0. The password is empty by default
  4. Set external_api_token to enable POST /v1/chat/completions, and send conversation_id to keep one session. The model field does not select a model
  5. Run it in a container for a hard boundary. The docs and the source both say the permission modes are not isolation

Tab

  1. Don't plan to call Tab from another agent. It answers only the owner's Messages or WhatsApp thread.
  2. Tell the owner that access needs a waitlist place and no price is published.

Questions

Which is better for AI agents, CowAgent or Tab?

CowAgent scores 58.5 (C) on agent readiness against Tab's 10.7 (F), and leads in 6 of 7 scored categories.

Are CowAgent and Tab open source?

CowAgent is open source (MIT). No open-source release is listed for Tab.

Other comparisons with CowAgent or Tab

Disclosure

Tab competes with LocalGhost, which Anchor Terminal's founder builds. It's graded by the same published checklist as every listing, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed instead of keeping either award by default.

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