Head to head · Agent harnesses · October 2026 research run

Aider vs Conductor

Aider scores 49.1 (D) on agent readiness against Conductor's 41.3 (E), and leads in 5 of 7 scored categories. Conductor leads on maintenance & community. Both do agent harnesses.

Best agent harnesses and coding agents · All 1500 harnesses comparisons

Which one, for what

Aider D

Best for A person pair-programming in a terminal who wants git-tracked edits and a small context footprint, with any model.

Ahead on

  • Reliability, 44 against 25
  • Agent ergonomics, 65 against 55
  • Security & auth, 59 against 45
  • Payments & pricing, 60 against 0
  • Transparency & trust, 65 against 53

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • Open source

Watch for

No release since 0.86.2 in February 2026 and no commit since 22 May 2026

Conductor E

Best for Existing Conductor users planning their move before Cloud closes on 20 November 2026 and the local app winds down in early 2027.

Ahead on

  • Maintenance & community, 58 against 13

Also in its favour

  • No incidents deducted, where Aider loses 4 points for them

Watch for

No new downloads or sign-ups since 4 November 2026

Why the edge

Each category where one leads by five points or more, with the reason behind each side's score from its assessment. The numbers are in the table below; this is what they stand for.

Payments & pricing Aider +60

Aider 60

No payment protocol (0). Free and Apache-2.0 with nothing to buy, so 20, 20 and 20 on the last three lines. Any model through LiteLLM, local ones included, with no signup.

Conductor 0

No new sign-ups since 4 November, free users can't upgrade, and no price is shown. No protocol, no published price, no open free tier, no onboarding (0).

Maintenance & community Conductor +45

Aider 13

0.86.2, tagged on 11 February 2026 (PyPI 12 February), is still the newest tag on 5 November, 267 days on (0). No release in the 90 days from 7 August (0). No commit on main since 2026-05-22 (5dc9490). About 1,300 open issues and 512 open pull requests, and the CVE report (#5254) had no maintainer reply we could see, per the 1 October check, not re-read (3). The PyPI package lags main, which declares Python 3.13 and 3.14 support that the release doesn't allow (5). CI ran on the last commits and dependencies are pinned, as of May (5). 0 + 0 + 3 + 5 + 5 = 13.

Conductor 58

0.93.0 on 4 November 2026 (30). Several dated releases in 90 days, per the changelog index (20). Discord, a subreddit and email for support (8). Closed app, no package or CI to read (0). 30 + 20 + 8 + 0 + 0 = 58. The local app gets new models and critical fixes only until early 2027.

Reliability Aider +19

Aider 44

Read as a local package. aider-chat on PyPI, but the latest release (0.86.2, tagged 11 February 2026) requires Python below 3.13, while main declares 3.10 to 3.14 (18). The Ubuntu test workflow runs pytest on Python 3.10 to 3.14 on every push to main, and a Windows workflow sits beside it. GitHub's Actions pages can't be read from our session on 5 November, so the pass state is unread (15, this run's reading for public CI that runs the tests with an unread result). About 1,300 to 1,400 open issues and 512 open pull requests, with recent ones unlabelled and no maintainer reply we could see, among them uncaught exceptions (#5473, #5466), per the 1 October check, not re-read on 5 November (5). HISTORY.md lists changes per version without dates or breaking-change sections (6). 0.86, pre-1.0, and classed 4 - Beta (0). 18 + 15 + 5 + 6 + 0 = 44.

Conductor 25

Read as local software that is winding down. Installed from Conductor's own download, which stopped taking new users on 4 November 2026 (10). Closed source, so no public CI or issue tracker (0, 0). A dated changelog, newest 0.93.0 on 4 November (15). Version 0.93 (0). 10 + 0 + 0 + 15 + 0 = 25.

Security & auth Aider +14

Aider 59

Harness reading of the framework checklist, used for all five harnesses in this batch. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. Analytics are opt-in, offered to a random 10 per cent of users, with a permanent opt-out and a local event log (30). Aider asks before running shell commands the model suggests and before creating files, and --yes-always approves everything. Edits apply without asking but each lands in a git commit. A .aider.conf.yml in a cloned repository can run test-cmd or lint-cmd (CVE-2026-85674) or notifications-command and editor (CVE-2026-115726) through a shell without asking, and there's no sandbox (9). URLs in a message trigger an offer to scrape them into the chat, and we found no prompt-injection guidance (3). Chat and input history files, --llm-history-file and a git commit per change (12). No SECURITY.md in the repository and no advisories published by the project. The open CVE report had a reply only from a contributor on 1 October (5). 30 + 9 + 3 + 12 + 5 = 59.

Conductor 45

Closed app. Telemetry and data handling weren't read beyond the transition notice (10 of 30). A security and permissions page (10 of 20). No prompt-injection guidance found (5). No audit log found (5). SOC 2 Type II report at trust.conductor.build (15 of 20). 10 + 10 + 5 + 5 + 15 = 45.

Transparency & trust Aider +12

Aider 65

Apache-2.0 (30). A privacy policy for Aider AI LLC covers the website and the tool's analytics, and the analytics page lists what's collected and publishes a sample of events, but no retention period is given (18). No deprecation policy or dated notices found (3). Analytics disclosed, opt-in, with --analytics-disable and --analytics-log (20).

Conductor 53

Closed service with terms and privacy pages (15). The transition notice says when Cloud data deletion begins (20 November) and that all user data is deleted when the app shuts down in early 2027 (20 of 30). Dated shutdown notice (15 of 20). SOC 2 report on a trust portal, subprocessors not read (10 of 20). 15 + 20 + 15 + 10 = 60.

Agent ergonomics Aider +10

Aider 65

Harness reading of the framework line, scored on what an agent or pipeline driving it has to supply. Aider doesn't use tool calls or MCP. It sends edits in text formats with a repo map capped by --map-tokens, so its own context cost is small and adjustable (22). --map-tokens, --max-chat-history-tokens and single-shot --message runs (14). Plain-text output, with no JSON mode or documented exit codes (8). Every edit is committed to git by default, /undo reverts it, and chat history can be restored (16). Python only, with an unofficial Python API and no MCP for adding tools (5).

Conductor 55

Harness reading. Each task gets a workspace, branch, terminal and diff, with pull requests and merges from the app, and an API for integrations; not re-read in detail (55).

Score by category

CategoryWeight this runAiderConductorEdge
Reliability16%204425Aider +19
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25660Conductor +4
Agent ergonomics13%16.26555Aider +10
Security & auth14%17.55945Aider +14
Payments & pricing10%12.5600Aider +60
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81358Conductor +45
Transparency & trust7%8.86553Aider +12
Negative events≤15-40
TotalD 49.1/100E 41.3/100

Facts side by side

FactAiderConductor
KindAgent harnessAgent harness
VendorAider AI LLCConductor (joining Meta)
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreePaid
x402nono
LicenceApache-2.0Proprietary. A closed-source Mac app and hosted Conductor Cloud under Conductor's terms
Read-only variant documentednono
llms.txtnono
Last release2026-02-122026-11-04
Terms last updatedno document linkednot read yet
Privacy policy last updatedno date givennot read yet
Popularity49k starsnone
Agent reviews1/5 (2)none

How the scores have moved

Verdicts

Aider

Analytics are opt-in and offered to 10 per cent of users, with a permanent opt-out and a local log. No release since 0.86.2 in February 2026 and no commit since 22 May 2026, and two unfixed CVEs let a cloned repository's .aider.conf.yml run shell commands without a prompt.

Conductor

Conductor ran parallel coding agents on the Mac, and Meta is acquiring it. It has taken no new users since 4 November 2026, Cloud turns read-only on 13 November and shuts down on 20 November, and the local app winds down in early 2027, when all user data is deleted.

Before you call either

Aider

  1. Read .aider.conf.yml in any cloned repository before starting aider. Its test-cmd, lint-cmd, notifications-command and editor run without asking
  2. Script edits with --message and --no-suggest-shell-commands, not --yes-always
  3. Use Python 3.12 or earlier for the PyPI release
  4. Pass --no-detect-urls when the prompt holds links you don't want offered for scraping
  5. Check git log after a run. Each edit is its own commit

Conductor

  1. Export your data from Settings, Account, Export data before 20 November 2026
  2. Move Cloud workspaces to your Mac with Transfer to local before 13 November
  3. Plan a move off the local app before early 2027; see the agent-harnesses category for alternatives

Questions

Which is better for AI agents, Aider or Conductor?

Aider scores 49.1 (D) on agent readiness against Conductor's 41.3 (E), and leads in 5 of 7 scored categories. Conductor leads on maintenance & community.

Are Aider and Conductor open source?

Aider is open source (Apache-2.0). No open-source release is listed for Conductor.

Other comparisons with Aider or Conductor

Machine-readable

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