P1 ChatOps vs GSA Per Diem
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
P1 ChatOps
This secure chat application facilitates mission execution for government customers. It requires an invitation to connect to specific servers and adherence to cybersecurity policies.
- Secure chat
- Collaboration capabilities
- Mission execution support
- Platform One integration
- Mattermost powered
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P1 ChatOps is the certified mobile application for Platform One (P1) and its customers. In conjunction with Mattermost, P1 ChatOps provides secure chat and collaboration capabilities for mission execution. The application is only intended for P1 customers. Contact your organization’s onboarding supervisor for instructions to connect to one of P1’s chat servers. Interested in becoming a customer? Learn more at https://p1.dso.mil. All users must abide by DoD and service/agency cybersecurity policy.
GSA Per Diem
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Plan federal travel and calculate per diem expenses with US Per Diem. Look up lodging and meals and incidental expenses (M&IE) rates for destinations across the United States, including Alaska, Hawaii, Puerto Rico, Guam, American Samoa, and the U.S. Virgin Islands. Rate information is sourced from data published by the U.S. General Services Administration (GSA) and the Defense Travel Management Office (DTMO). PER DIEM RATE LOOKUP • Search by state or territory, fiscal year, and location. • View monthly lodging and M&IE rates. • Review breakfast, lunch, dinner, and incidental expense allocations. • See the 75% M&IE allowance for first and last travel days. TRIP EXPENSE REPORTS • Select a destination and travel dates to calculate estimated reimbursement. • View a daily breakdown of lodging, meals, and incidental expenses. • Use the applicable rate when a trip crosses fiscal years. • Automatically exclude lodging on the final travel day. PDF AND CSV EXPORTS • Export rate lookups and complete trip reports. • Open reports in compatible PDF and spreadsheet apps. • Save or share files using the standard iOS sharing options. US Per Diem is useful for federal travelers, travel coordinators, and anyone who needs a convenient per diem calculator or travel expense report. US Per Diem is an independent reference and planning tool. It is not affiliated with or endorsed by GSA, DTMO, the Department of Defense, or the U.S. government. Always confirm applicable rates and reimbursement rules with your organization before travel or submission.
Screenshots
Verdict
The clearest difference is ads: P1 ChatOps at none against GSA Per Diem's shown. GSA Per Diem's advantage is update cadence (monthly vs every 4 months). On price, in-app purchases, device support and iOS requirement 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
P1 ChatOps ships an update every 4 months, GSA Per Diem monthly. The most recent releases landed on October 10, 2026 and October 18, 2026 respectively.
| Parameter | P1 ChatOps | GSA Per Diem |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (21 ratings) — better | — |
| Positive reviews | 8.3% of reviews | — |
| Number of ratings | 21 — better | — |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 14.0 — better |
| Further details — not scored | ||
| Size | 90 MB | 48 MB |
| Age rating | 4+ | 17+ |
| Developer | USAF-BESPIN | Kiarash Torkian |
In-app purchases
P1 ChatOps
No in-app purchases
GSA Per Diem
No in-app purchases
Questions
Is P1 ChatOps free?
Is GSA Per Diem free?
Do P1 ChatOps or GSA Per Diem have ads?
Which is updated more often, P1 ChatOps or GSA Per Diem?
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