Cycling through all six. Tap any point to stop.

Measured on six things

Merge multiple Outlook PST files into one without data loss.

Security

HTTPS enforced but the header probe found only 3/13 checklist items: no HSTS, CSP, frame protection, Referrer-Policy or Permissions-Policy, and DMARC is missing. No security page, SOC 2, ISO or bug bounty. Standard for a small desktop-utility vendor, but thin.

Screenshots

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GainTools Merge PST Software

About this app

GainTools Merge PST Software is designed to merge several Outlook PST files into one file fast and effortlessly. It provides a simple option for users who want to manage their Outlook data in one location. The program needs no technical support and offers a simple user interface for both beginners and professionals. It supports the original quality of the files. Users can add or exclude deleted items as they like. The program produces a new PST file and safely merges it, ensuring that there is no loss of data. Users don't need to have Outlook installed to do the merge. It’s very compatible with Outlook 2021 and previous versions. The application can disregard the empty directories to retain the combined PST file in an ordered manner. Supported versions of Windows are Windows 11, 10, 8, 7, and previous versions of Windows. Some of the software applications also include a free demo version for users to sample the product before buying the complete version.

Key features

1Merges multiple Outlook PST files (ANSI and Unicode) into a single PST without requiring Outlook installed.
2Two merge modes: one combined folder, or a new folder per source PST; can merge entire files or selected folders only.
3Free trial (2.14 MB, no registration) and $29 lifetime license with a 30-day money-back guarantee.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

IT administrators in enterprises

Pain points

Managing many PST files from different users or backups

Primary needs

Consolidate PST files for easier backup and compliance

Demographic

Users upgrading Outlook versions

Pain points

Merging old PST files with new ones after upgrade

Primary needs

Preserve emails and contacts while combining PSTs

Demographic

Individuals with multiple email accounts

Pain points

Scattered PST files from different accounts

Primary needs

Unify emails and contacts into one PST for easy access

Scout Review

Written by AI from measured evidence, scored out of 100.

GainTools Merge PST is a cheap, fast, single-purpose Windows utility for combining Outlook PST files, sold at $29 lifetime with a no-registration trial. The marketing site is quick and the onboarding is genuinely simple, but the design is dated, the security headers are largely absent, and the '824 ratings, 4.8/5' claim has no visible third-party source. It works for the narrow job it names — merging healthy ANSI and Unicode PSTs — and it does not pretend to repair broken ones. Against SysTools and Stellar it competes on price, not capability.

Measure by measure

Usability

Clear four-step guide, an FAQ, a 2.14 MB no-registration trial and a $29 lifetime license make evaluation cheap and fast. The FAQ admits corrupt/inaccessible PSTs can't be merged, which is an honest but real limitation. Solid, unremarkable utility onboarding.

Design

Functional but dated marketing page: emoji section headers, template layout, and a self-reported 4.8/5 from 824 ratings with no review-platform attribution. The Windows utility UI is only glimpsed via a 'Screens' tab. On par with low-cost utility-vendor peers, behind Stellar and SysTools polish.

Speed

Lighthouse mobile 100/100 (LCP 1.5s, CLS 0, TBT 60ms) and desktop 99/100. The marketing site is a lightweight static page and the installer is only 2.14 MB. Clearly ahead of typical utility-vendor sites, which are usually ad-heavy and slow.

Security

Accessibility

Lighthouse accessibility 95/100, with two real failures: buttons lacking accessible names and visible labels not matching accessible names. No WCAG statement, English-only, Windows-only. Automated score is strong; the specific button-label failures are a genuine, fixable flaw.

Growth

Real but shrinking problem: PST merging matters less every year as orgs move to Exchange Online. Competes with SysTools and Stellar, both broader suites; GainTools' wedge is a $29 lifetime price. Domain is 9.5 years old — mature, not growing.

Improvement areas

No repair capability — the FAQ confirms inaccessible or corrupt PST files cannot be merged.
Security posture is thin: 3/13 header checklist items, no DMARC, no security page, no SOC 2 or ISO claim.
Self-reported '824 ratings, 4.8/5' with no third-party review platform linked; two Lighthouse a11y failures remain.

Design & Usability

The marketing page is a competent but visibly dated template: emoji used as section headers, a self-reported '824 ratings, 4.8/5' with no review-platform attribution, and the actual product UI only visible behind a 'Screens' tab. Usability is the stronger half — a clear four-step guide, an FAQ, a 2.14 MB trial with no registration required, and a $29 lifetime license make it trivially cheap to evaluate. The FAQ is honest about a real limit: inaccessible or corrupt PST files cannot be merged, only healthy ones. Against SysTools and Stellar, the design reads as behind and the usability as roughly on par.

Speed & Security

Speed is the standout: Lighthouse mobile 100/100 with LCP 1.5s, CLS 0 and TBT 60ms, desktop 99/100, on a lightweight static page with a 2.14 MB installer. That is clearly ahead of the ad-heavy norm for desktop-utility vendor sites. Security is the weak flank: HTTPS is enforced, but the header probe found only 3 of 13 checklist items — no HSTS, CSP, frame protection, Referrer-Policy or Permissions-Policy, and DMARC is absent despite SPF being present. There is no security page, no SOC 2 or ISO claim, and no bug bounty; the site leans on a 'Virus Free' badge and a 30-day money-back guarantee instead. For a small vendor handling users' email archives, that is thin.

Accessibility & Growth

Accessibility scores 95/100 on the automated Lighthouse audit, but two real failures remain: buttons without accessible names and visible text labels that do not match their accessible names. There is no WCAG statement, the product is Windows-only and English-only, and emoji used as section headers get read aloud literally. Growth is the harder question. The problem is genuine — consolidating scattered PST files for backup, compliance or post-upgrade cleanup — but it is a shrinking need as organizations shift to Exchange Online. SysTools and Stellar both offer broader suites in this niche; GainTools' only clear wedge is a $29 lifetime price against their higher tiers. A 9.5-year-old domain and four social profiles show a stable small vendor, not a growing one.

Conclusion

If you have a handful of healthy PST files to consolidate and you want to spend $29 once instead of a subscription, this does the job and the trial lets you confirm it before paying. If your PSTs are corrupt, or you need compliance documentation, audit trails or a vendor with a published security program, look at SysTools or Stellar instead. The category itself is contracting as PSTs fade from modern email workflows — buy accordingly.

Suggestions for improvement

Publish the source of the '824 ratings, 4.8/5' claim — link to Trustpilot, G2 or a verifiable review platform.
Add HSTS, CSP, X-Content-Type-Options, Referrer-Policy and a DMARC record; the probe found only 3/13 header items.
Fix the two Lighthouse accessibility failures: give buttons accessible names and align visible labels with accessible names.
Add a security/privacy page explaining how PST data is handled locally, and consider a WCAG conformance statement.

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	GainTools Merge PST Software	SysTools PST Merge	Stellar Merge Mailbox for Outlook
Price model	$29 lifetime license; free trial available	Tiered licensing, typically higher than $29; demo version available	Tiered licensing; free trial with limits
Merge modes (combined vs. separate folders)	Yes — one folder or new folder per PST	Yes — join/combine modes with folder options	Yes — merge into single PST with folder options
Handles corrupt or inaccessible PST files	No — FAQ states only healthy PST files can be merged	Vendor offers separate PST repair tooling alongside merge	Vendor offers separate PST repair tooling alongside merge
Requires Outlook installed	No — standalone merge	No — standalone merge	No — standalone merge
Platform support	Windows only (11/10/8/7 and earlier)	Windows	Windows