# Architect's Formulator vs Invoice Manager

The clearest difference is review sentiment: Invoice Manager at 39% against Architect's Formulator's 20%. Invoice Manager also leads on update cadence (every 2 weeks vs every 2 months) and monetization model (free with in-app purchases vs paid). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Architect's Formulator sells 1 one-off in-app purchase and Invoice Manager sells 10 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Architect's Formulator ships an update every 2 months, Invoice Manager every 2 weeks. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Architect's Formulator | Invoice Manager |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (2 ratings)](https://appshunter.io/ios/app/architects-formulator/id310925486/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 20.0% of reviews | **38.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 37 MB | 113 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [iCubemedia Inc.](https://appshunter.io/developer/453286185) |

## What reviewers say

### Architect's Formulator

[App page](https://appshunter.io/ios/app/architects-formulator/id310925486)

A comprehensive professional calculator for architects, engineers, and construction professionals. It offers over 2,000 formulas across structural, electrical, mechanical, plumbing, and carpentry disciplines, along with unit conversions and reference tables.

**Highlights:** Over 2,000 professional formulas, US and Metric unit conversions, Save and export calculations, Favorite frequently used calculators, Reference tables and ADA guidelines

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $5.99 | one-time |


### Invoice Manager

[App page](https://appshunter.io/ios/app/invoice-manager/id586658256)

Streamline your business operations with AI-powered invoice creation, instant receipt processing, and automated time and mileage tracking. This app helps freelancers, contractors, and business owners save time on administrative tasks and gain valuable financial insights.

**Highlights:** AI-powered invoice creation, Instant receipt scanning and categorization, Automated GPS mileage tracking, Voice-controlled time tracking, Predictive business intelligence, Automated accounting and reporting

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Tier | $4.99 | per 7 days |
| Premium Tier | $19.99 | per month |
| Yearly Tier | $99.99 | per year |
| 3 Month Backup Plan | $0.99 | one-time |
| 6 Month Backup Plan | $1.99 | one-time |
| Time Sheet | $4.99 | one-time |
| Receipt Tracker | $4.99 | one-time |
| Sync: Device to Device | $9.99 | one-time |
| Full Version | $199.99 | one-time |
| Lifetime Tier | $299.99 | one-time |

**What reviewers like**

- 💡 Useful inventory tracking and barcode scanning features
- 👍 Customizable invoice templates
- 🚀 Fast and efficient invoicing process
- 💡 Ability to manage multiple businesses in one app
- 👍 Helpful customer support

**What reviewers complain about**

- 🐛 Crashes and freezes when opening invoices or trying to sync data
- 🐛 Issues with currency conversion and tax calculations
- 🐛 Unreliable cloud backup and sync functionality
- 👎 Confusing and cluttered user interface
- 👎 Lack of communication from developers about updates and issues

**Reported bugs**

- Invoices disappearing or being marked as unpaid after updates
- Inability to delete or edit products/services
- Syncing issues between devices
- Crashes when trying to print or email invoices

**Requested features**

- Ability to mark invoices as paid
- Option to sort and filter invoices by various criteria
- Improved reporting and analytics features
- Better integration with accounting software
- Easier way to manage inventory and product information


## Frequently asked questions

### Is Architect's Formulator free?

Architect's Formulator is free to download, with in-app purchases available.

### Is Invoice Manager free?

Invoice Manager is free to download, with in-app purchases available.

### Do Architect's Formulator or Invoice Manager have ads?

Neither Architect's Formulator nor Invoice Manager shows ads.

### Which is updated more often, Architect's Formulator or Invoice Manager?

Architect's Formulator ships an update every 2 months, and Invoice Manager every 2 weeks. Most recently, Architect's Formulator was updated on October 31, 2026 and Invoice Manager on November 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*