Comparison

LETS Investigate vs mailin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

LETS Investigate

Securely capture and store investigative media like photos, videos, and audio. All evidence is encrypted, timestamped, signed, and audited on remote servers to ensure its integrity and prevent modification for legal cases.

Highlights
  • Secure media storage
  • Encryption
  • Timestamping
  • Digital signing
  • Audit trails
  • Remote server storage
Features
Read full description

Get your phone out of the chain of custody. If you’re using a work or personal phone for investigative work, it’s a legal liability. LETS Investigate stores and encrypts any photos, video or audio created within the app on secure remote servers. Evidence is timestamped, signed, and audited the moment it’s created on your device so you can be sure that it’s never modified and that you can produce the original file for your cases.

About

mailin

Features
Read full description

mailin is a private email archive analyzer for Mac, iPhone and iPad. Open .mbox, .eml, .emlx, .msg, .pst, .ost, .nsf or .zip files from Gmail Takeout, Apple Mail, Thunderbird, Outlook or Lotus Notes — then search, analyze, recover and export your email history. Everything runs on your device. Nothing leaves it. THE ARCHIVE • On iPad: mailboxes, the list and the message side by side. On iPhone: a fast list with full search. • No built-in size limit: mail is streamed from disk. Checked on real mail files up to 1.5 GB. • Import queue with pause, resume and reorder, and a receipt for every import. SEARCH • Boolean AND / OR / NOT, "exact phrase", regex, NEAR proximity and relevance ranking. • Results say where they matched and how much of the archive was searched. • Finds words inside scanned PDFs and photos attached to emails, read on your device. FIND DELETED MAIL mailin marks mail that was deleted but is still inside your mailbox files, and says how each message was found. Deep recovery searches the free space of Outlook files for messages no folder lists any more. ON-DEVICE AI • Ask questions in plain language; every answer lists the emails it came from. Counts, dates and amounts are read from your archive by the app, not written by the model. • Summaries, digests, sentiment, topics, language detection, priority scoring, anomaly detection. • Runs with Apple's on-device models. No cloud AI. LEGAL & FORENSIC • Custodians, legal holds, chain of custody, tamper-evident audit log, review batches, predictive coding, redaction. • SPF, DKIM, DMARC and ARC checks, S/MIME, hidden header timestamps. • Review Packs and team cases with signed logs and second-level review — reviewers need no purchase. • Scripts and Shortcuts actions that tag, hold, number and export emails after a dry run. PRIVATE No account, no tracking, no telemetry. The app has no network access; your archive is a folder you own. Biometric lock available. Interface in 11 languages. PLANS • Free: the newest 500 emails of your archive, with search, analytics and a daily allowance of AI questions. • Personal: the whole archive, unlimited exports, the AI assistant, deleted-mail recovery. • Professional: adds the legal, forensic, review, scripting and deep-recovery tools. SUBSCRIPTIONS mailin Personal and mailin Professional are available as auto-renewable subscriptions (1 month or 1 year) or as a one-time lifetime purchase. Prices are shown in the app in your local currency. Payment is charged to your Apple Account when you confirm the purchase. A subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the period ends. Manage or cancel subscriptions in your Apple Account settings at any time. Terms of Use: https://sasmalgiri.github.io/mailin/terms Privacy Policy: https://sasmalgiri.github.io/mailin/privacy DISCLAIMER mailin is not a certified forensic tool and does not give legal advice. AI analysis, deleted-mail recovery, text read from scanned attachments, header timestamps and signature checks can be incomplete or wrong; verify results independently before relying on them in legal or business decisions. Outlook is a trademark of Microsoft Corporation. mailin is not affiliated with Microsoft. mailin augments your judgment; it does not make legal determinations for you. All software, including AI features, can produce inaccurate or incomplete results — always verify important outputs before relying on them. Forensic features (chain-of-custody, Bates numbering, signed exports, HMAC-chained audit logs) support common forensic and eDiscovery workflows, but the admissibility of digital evidence is jurisdiction-specific. Consult qualified legal counsel for evidentiary use. mailin makes no warranty of fitness for any specific legal or regulatory purpose.

Screenshots

LETS Investigate4 screens
mailin4 screens

Verdict

The call

The clearest difference is in-app purchases: LETS Investigate at none against mailin's 4. LETS Investigate also leads on iOS requirement (12.0 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. mailin sells 4 in-app purchases, starting at $4.99 per month. LETS Investigate asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 24, 2026.

Scorecard2 real differences · 8 level
LETS Investigate versus mailin: the parameters behind the verdict, then further details
ParameterLETS Investigatemailin
PriceFreeFree
Rating2.6 (7 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings7 — better—
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better17.6
Further details — not scored
Size92 MB37 MB
Age rating4+4+
DeveloperLETS - A Law Enforcement Technologies CorporationShrabani Sasmal

In-app purchases

None

LETS Investigate

No in-app purchases

4 purchases

mailin

Subscriptions4
  • mailin personal monthly$4.991 Month
  • mailin professional monthly$9.991 Month
  • personal yearly 01$44.991 Year
Show 1 more
  • mailin professional yearly$79.991 Year

Questions

Is LETS Investigate free?
LETS Investigate is free to download, with no in-app purchases.
Is mailin free?
mailin is free to download, with in-app purchases available.
Do LETS Investigate or mailin have ads?
Neither LETS Investigate nor mailin shows ads.
Which is updated more often, LETS Investigate or mailin?
LETS Investigate ships an update every 2 months, and mailin every 2 months. Most recently, LETS Investigate was updated on October 24, 2026 and mailin on October 24, 2026.

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