Comparison

Optimal Blue vs DayProof

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

Head to head
About

Optimal Blue

Access a comprehensive mortgage pricing and product engine on your mobile device. Track market indices, receive real-time updates, and generate instant, accurate loan quotes. Ideal for mortgage professionals needing on-the-go access to pricing data and scenario analysis.

Highlights
  • Mortgage product, pricing, and eligibility engine
  • Track mortgage market indices (OBMMI™)
  • Receive push notifications for updates
  • Price scenarios and save favorites
  • Automatic scenario refresh
  • Access full pricing inputs and custom fields
  • View eligible and ineligible products with reasons
Features
Read full description

Access the industry’s most widely used product, pricing and eligibility engine anywhere! Optimal Blue PPE (OB) Mobile provides key functionality to support loan officers and other mortgage industry professionals on-the-go. The app allows you to track the Optimal Blue Mortgage Market Indices (OBMMI™) and receive push notifications for updates. OBMMI™ provides the most comprehensive, accurate, timely, and interactive analysis of pricing ever conducted in the mortgage industry. Calculated from actual locked rates with consumers across 42% of all mortgage transactions nationwide, OBMMI includes multiple mortgage pricing indices developed around the most popular mortgage products. For Optimal Blue customers, you can also log in to price scenarios and save favorites to your dashboard for quick access. Scenarios can be automatically refreshed with a single tap, allowing you to easily see the best product, rate, price and more. This capability helps you understand how interest rates are moving on a given day, directly from your mobile device – no paper rate sheet required! These easily accessible scenarios can assist in conversations with prospective borrowers before an application is taken. With the app, Optimal Blue customers can access the full array of pricing inputs you’re used to seeing on the web version of the Optimal Blue PPE, including any custom fields. This allows for an instant, accurate quote. Additionally, search results include the full granularity you’re used to accessing on the web. All eligible products and rates are displayed, including any adjustments, notes and advisories. Ineligible products are displayed along with an ineligibility reason.

About

DayProof

Features
Read full description

Count the days between two dates, add or subtract business days, and find the date you need. DayProof is a free date calculator for everyday questions and work deadlines — with no ads and no account. CALCULATE A DATE OR COUNT DAYS • Add or subtract calendar days, business days, weeks, months, or years. • Count calendar days or working days between two dates. • Work backward from a deadline to find your latest start date. • Choose whether to include the start and end dates. SEE WHICH DAYS COUNT Review your result on an interactive calendar. Tap a date to see whether it was counted or skipped, and why. Check excluded weekends, holidays, and the rules behind the result. USE YOUR WORKING CALENDAR Choose your working weekdays and selected holiday calendar. Built-in calendars cover US Federal, Canada Federal, England & Wales bank holidays, and Australia National holidays. Create custom rule profiles for company closures and additional regional holidays. Choose how results move when they land on a non-working day. PLAN CONNECTED DEADLINES Build a project timeline with linked milestones, such as Notice → Response → Delivery. Change the starting date and recalculate the timeline. Save reusable templates for work you repeat. SAVE AND SHARE THE CALCULATION • Revisit saved calculations and their rules. • Export PDF reports showing the result and calculation details. • Add project milestones to Apple Calendar. • Run supported calculations with Shortcuts. FREE BASICS. OPTIONAL ONE-TIME PRO. Basic date calculations are unlimited and free, and work offline. Advanced features include 3 custom rule-profile creations, 3 project creations, 1 saved template, 3 PDF exports, 3 Calendar syncs, and 3 actions to add favorites. These are total included uses, not daily allowances. Existing projects and rules remain editable after the included creations are used. A one-time DayProof Pro purchase removes these advanced-feature usage limits. No subscription. Results depend on your selected rules and calendars. Verify important deadlines against the documents and requirements that apply to your work. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Optimal Blue4 screens
DayProof4 screens

Verdict

The call

The clearest difference is in-app purchases: Optimal Blue at none against DayProof's 1. 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. DayProof sells 1 one-off in-app purchase. Optimal Blue asks for nothing beyond the download.

UpkeepUpdate frequency

Optimal Blue ships an update monthly, DayProof fortnightly. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

Scorecard1 real difference · 9 level
Optimal Blue versus DayProof: the parameters behind the verdict, then further details
ParameterOptimal BlueDayProof
PriceFreeFree
Rating4.9 (210 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings210 — better—
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS18.618.0 — better
Further details — not scored
Size37 MB24 MB
Age rating4+4+
DeveloperOptimal Blue LLCBE A MAN PTY LTD

In-app purchases

None

Optimal Blue

No in-app purchases

1 purchases

DayProof

One-time1
  • DayProof Pro Lifetime$7.99

Questions

Is Optimal Blue free?
Optimal Blue is free to download, with no in-app purchases.
Is DayProof free?
DayProof is free to download, with in-app purchases available.
Do Optimal Blue or DayProof have ads?
Neither Optimal Blue nor DayProof shows ads.
Which is updated more often, Optimal Blue or DayProof?
Optimal Blue ships an update monthly, and DayProof fortnightly. Most recently, Optimal Blue was updated on November 7, 2026 and DayProof on November 6, 2026.

Other comparisons