See it in action
Real screens from mailin — guided workflows, the Work Center, and the on‑device analysis tools.
mailin 2.0 keeps every v1 feature — the persona-driven UI, the full analysis suite, the on-device AI — and rebuilds the storage, ingest, and search layers underneath for archives that were never realistic on v1.
Drop a 200 GB Gmail Takeout and walk away. v2 drains messages in batches of 200; peak memory stays flat regardless of file size.
Per-file SHA-256 plus per-batch checkpoints. A crash 800 GB into an import resumes from the last batch — re-work capped at one batch of 200 messages.
Search splits across per-year SQLite shards with bm25 ranking. Time-bounded queries hit one shard; cross-archive queries fan out and merge.
Jump to email #1,000,000 — it responds in a heartbeat. The old offset-scan freeze at depth is gone. Stable across timestamp ties.
Memory-mapped readers. PST/OST up to 50 GB; NSF up to 64 GB. Multi-GB files no longer materialise in RAM.
No telemetry, no analytics, no third-party SDKs. v2 stores data in the exact same on-device location as v1 — existing users get a free in-place upgrade.
Pick the job you came to do — mailin runs each step, auto-saves, and keeps a numbered, reopenable record. 47 built-in workflows across all five roles.
Offline by default. mailin needs no account and works fully offline. The only feature that can send anything out is the optional Cloud AI mode — opt-in, off by default, and clearly disclosed in-app. Otherwise your archive stays on your device.
Real screens from mailin — guided workflows, the Work Center, and the on‑device analysis tools.
The same on-device engine, Universal Purchase — buy once, use everywhere.
By default, mailin runs AI locally using Apple's own frameworks — no cloud, no API key. An optional Cloud AI mode is available if you choose it: opt-in, off by default, and it uses your own provider key.
No conversion. No middleman. Drop the file in — mailin parses it natively.
Import, read, search, and understand years of email — right out of the box, free to start.
Drag in a Gmail Takeout, an Outlook export, or a folder of messages. mailin parses it natively, threads the conversations, and shows a clean, readable inbox — no conversion, no upload.
A full-text index built entirely on-device, with the query power you'd expect from a real search engine — measured millisecond-level page latency at million-message scale.
See the shape of your archive at a glance — who you talk to most, when your inbox is busiest, and what's taking up space. All interactive, all on-device.
Ask plain-language questions about your archive and get summaries, sentiment, and key topics — powered entirely by Apple's on-device AI. Nothing leaves your device.
New in 2.0 — pick the job you came to do and mailin walks you through it, wiring the right tools together and keeping a numbered record as you go.
47 built-in workflows across Forensic, Legal, IT, Journalist, and Personal — each named in the terms you already use. A roadmap rail shows where you are and what's next; heavier tools open beside the job, bound to it.
Whether it's a two-minute task or a full investigation, mailin saves it under a document number you can reopen to the complete saved work, export to CSV, and pull into custom cross-document reports — a clear record trail for your whole archive.
A comprehensive toolkit for legal, compliance, and investigative work — and a delightful daily driver for anyone with old email archives.
Ask plain-language questions about your archive. Powered entirely on-device by Apple Intelligence and Apple NaturalLanguage — no cloud, no API key.
Email volume timeline, top contacts, activity heatmaps, attachment breakdowns, and relationship graphs — all interactive, all on-device.
AI categorizes emails by topic, sender intent, and priority — with manual override and per-tier custom expert configurations.
Flag unusual sending patterns, suspicious timing, and IOC artifacts (IPs, URLs, file hashes) extracted automatically.
Export to EML, JSON, CSV, PDF, Bates-stamped PDF, or Concordance load files. Bulk attachment download. Signed for verification.
Generate a summary of important emails from any time range. Sentiment trends, urgent items, key threads — surfaced automatically.
Enable tamper-evident workflows: requires hash verification and enforces audit logging on every action. Everything stays on-device.
Pick your role — Forensic, Legal, IT Admin, Journalist, or Personal — and mailin tailors the interface and its guided jobs to your work.
47 step-by-step jobs across every role, with a "you are here" roadmap, auto-save, and optional sign-off — mailin wires the tools together for you.
Every job is saved under a document number you can reopen, export to CSV, and pull into cross-document reports — plus per-email history and case activity.
Read the SPF / DKIM / DMARC results reported by the receiving mail server. Inspect routing chains, MIME trees, and attachment integrity in technical detail.
Scan on-device for personally identifiable information — emails, phone numbers, SSNs, cards, IPs and more — grouped by type with source and risk, exportable to CSV.
Find and remove exact duplicates archive-wide, keeping one clean copy. Deletions stick — re-importing the same file never silently brings them back.
Flag the patterns that matter — senders, keywords, timing and thresholds — so the important messages surface without hunting for them.
One click reconstructs a whole conversation as a cited, chronological timeline — with an optional on-device AI narrative over just that thread.
A one-glance KPI overview of the archive — volumes, top contacts, activity and risk — ready to hand to a manager or drop into a report.
Track custodians, assign their mail, and place legal holds that protect held messages from deletion — the backbone of a defensible collection.
Anyone who needs to make sense of an email archive — at any scale.
Review email evidence, run privilege checks, build review batches, and produce Bates-stamped sets for disclosure.
Hash-verified imports, tamper-evident audit logs, signed exports, and verifiable artifacts for high-integrity workflows.
Inspect SPF/DKIM/DMARC headers, trace routing, find phishing patterns, and investigate compromised accounts.
Track sources, build story timelines, find connections across thousands of messages, and protect source confidentiality.
Analyze your own email history with confidence. Nothing ever leaves your device unless you explicitly choose it.
Buy once. Use everywhere. Your archive stays strictly on-device on each of your Apple devices.
Subscribe or buy once, and mailin works across every Apple device signed into your Apple Account.
For the technically curious — exactly how mailin works.
MBOX, EML, EMLX, MSG, PST, OST, NSF — all parsed natively. RFC 822 + full MIME compliance: multipart, base64, quoted-printable, charset decoding. Streaming parser so 10GB+ Gmail Takeouts don't OOM.
Full-text index built locally. Operators: AND/OR/NOT, regex, NEAR/n. Indexes subject, headers, body. Threading via Message-ID / In-Reply-To / References.
Apple NaturalLanguage for sentiment, entities, language detection. Foundation Models (macOS 26+) for summaries and Q&A. All local — no cloud model, no API key, no network round-trip.
Offline by default. The only feature that transmits anything is the optional, opt-in Cloud AI mode (using your own OpenAI/Anthropic key) — off unless you enable it. No telemetry, no analytics, no data collection by the developer. Every AI output is tagged with the engine that produced it (AIProvenance).
SHA-256 hash on every email at import. HMAC-chained audit log where each entry signs the previous (tamper-evident). Ed25519-signed exports. Bates numbering with configurable prefix and padding.
Start free with 500 emails. Upgrade when you need more. Lifetime tiers available — no recurring charge.
Download mailin today on iPhone, iPad, or Mac. Free tier included. No signup required.
Direct link: https://apps.apple.com/app/mailin/id6767245397
Universal Purchase · iOS 17.6+ · macOS 14.6+ · Free tier always available