Comparison

Task Office lite vs Erebus Solar

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

Head to head
About

Task Office lite

Organize your daily tasks, projects, and contacts with this comprehensive GTD organizer. Plan your day, track project progress, and manage team collaborations. Syncs with your existing calendars for seamless scheduling.

Highlights
  • Daily task and project planning
  • Contact and relationship management
  • GTD methodology organization
  • Calendar synchronization (iCloud, Google, Exchange)
  • Team management and collaboration
  • Visualized daily, weekly, monthly calendar views
  • Progress tracking for projects
Features
Read full description

Task Office is the best of ever existing GTD, to do lists, projects and contacts management apps. Manage both simple and complex projects, to do lists without any difficulties and focus on the final result. Manage your contacts and relationships, schedule your time and succeed. Planning & Performing • Start scheduling each new day on Home screen. Here you will find your current projects and to dos: a timeline with tasks you have planned for today and outline of upcoming tasks. Home screen allows you to focus only on current tasks, planned for today, and not to get lost in plenty of other planned tasks. You can plan your day directly from Home screen creating new tasks, projects, contacts and companies Quick & Easy navigation • Reach any project, task, to do list or contact in seconds. Task Office is designed in a way that will allow you to navigate within app screens just in one tap • Organize your tasks by categories, projects or priorities and make a logic order of all your plans Detailed GTD • Add all important details to get things done: choose tasks category, status, priority and set dates • Assign tasks to people by choosing a person from all existing contacts • Add locations to each task and project • Make all your information categorized – assign special categories for easy filtering and browsing through tasks and projects Comprehensive GTD Tab • All tasks are organized according to GTD methodology (by D. Allen) • Add tasks of different types: - ToDo – tasks with duration of several days - Appointment – assign task duration accurate to minutes - Email/Call – short task for making calls or sending emails to any user Alerts • Use double alert and let the program remind you what is next to be done Tracking project progress • Track the progress of your projects and to do lists by viewing the pipeline: view the percentage of work performed and how many tasks still need to be done • Check out everyone who is involved in project: view the list of contacts involved in the project Managing your team • Create new contacts and companies; add all the important information about your contact or company. Either you can import existing contact from your iOS device Address Book • Send e-mails directly from Contacts Screen • Group your contacts creating your Private Lists, so that you can easily monitor their productivity and track task implementation. Save each Private list and refer back to easily Visualized Calendar • Task Office calendar allows you to focus on what is important in your timeline. See your planed To Dos, Appointments, Emails/Calls to get things done in time • View calendar by day, week or month • Add tasks directly to the Calendar by Tap&Hold • Change tasks duration or Start and Due Dates simply Drag&Drop Calendar Syncing • Task Office syncs with Calendars (iCloud, Google Calendar, Exchange, Yahoo, Outlook) and you will not miss anything checking out due dates iCloud Sync • Sync your information – tasks, projects, contacts, etc. – between your devices Repeating tasks • Add repeated tasks, choosing recurrences frequency Set goals and achieve them. Become a part of Task Office team today!

About

Erebus Solar

This app helps solar professionals measure on-site shade using their phone's sensors. It generates horizon files compatible with leading PV design software, aiding in accurate solar production estimates.

Highlights
  • AR sun path visualization
  • Automatic sky capture
  • Sky Editor for obstruction tracing
  • Annual solar access analysis
  • PDF shade report export
  • Horizon file generation for design tools
  • Project organization by site
Features
Read full description

Measure shade on site with the hardware already in your pocket. Erebus Solar was designed by an electrical engineer and an architect with years of experience designing solar systems around the world. We were fed up with the horizon-finding hardware the industry still relies on: dedicated devices that haven't been meaningfully updated in decades, are slow to use and slow to find a GPS fix, and analog tools that need paper, a pencil and a latitude template that may not exist for your site. Erebus Solar is our answer. Your iPhone already has the camera, compass and sensors the job needs. WHY HORIZON FILES MATTER Far-field shading from trees, terrain and neighbouring buildings is one of the largest sources of error in a PV production estimate. A measured horizon profile, captured on site, lets your design software model that shading instead of guessing. Erebus Solar produces horizon files that leading PV design tools such as HelioScope and PVsyst read directly, and PV*SOL accepts the same convention. CAPTURE • AR sun path: today's arc, the solstice and equinox arcs and the live sun drawn over the real sky • Tap the real sun to calibrate the compass to true north • Automatic sky capture: sweep the envelope band and frames capture themselves, no buttons • Sky Editor: review the stitched sky and trace obstructions by hand, so the report reflects what you saw ANALYSE • Annual solar access and TSRF for each array area • Month-by-month charts and the sun-path chart with your obstructions • Aerial view with each area's boundary and the solar envelope over satellite imagery EXPORT • PDF shade report with your company name and logo • Horizon files for HelioScope, PVsyst and PV*SOL, generated from the same capture • Share straight from the phone ORGANISE • One project per site, located by address or GPS, with status from Created to Completed • Areas for each roof face or ground section • Everything stored on your iPhone: no account, no upload Erebus Solar's outputs are a design aid for qualified professionals. Results depend on the phone's sensors, compass calibration and sky conditions; check them against your own observations and your design tool's simulation before relying on them. Privacy Policy: https://erebussolar.app/privacy Terms of Use: https://erebussolar.app/terms

Screenshots

Task Office lite4 screens
Erebus Solar4 screens

Verdict

The call

The clearest difference is review sentiment: Task Office lite at 53% against Erebus Solar's 0%. Task Office lite also leads on rating (4.0 vs 3.7) and ratings volume (16 vs 3). Erebus Solar's advantage is in-app purchases (none vs 2). On price, update cadence, ads and monetization model 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. Task Office lite sells 2 one-off in-app purchases. Erebus Solar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Task Office lite holds the better App Store score, 4.0 against 3.7. That said, the two scores are not equally well evidenced: Task Office lite has 16 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 53% of Task Office lite's written reviews are positive against 0% of Erebus Solar's.

UpkeepUpdate frequency

Task Office lite ships an update every 3 weeks, Erebus Solar every 2 weeks. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
Task Office lite versus Erebus Solar: the parameters behind the verdict, then further details
ParameterTask Office liteErebus Solar
PriceFreeFree
Rating4.0 (16 ratings) — better3.7 (3 ratings)
Positive reviews53.3% of reviews — better0.0% of reviews
Number of ratings16 — better3
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.0 — better17.0
Further details — not scored
Size85 MB19 MB
Age rating4+4+
DeveloperDK CONSULTING, TOVTodd Evans

Customer experience

Task Office lite

All ratings16 ratings
Positive75.0%
Neutral6.3%
Negative18.8%
Written reviews15 reviews
Positive53.3%
Neutral13.3%
Negative33.3%

Erebus Solar

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

2 purchases

Task Office lite

One-time2
  • Start Trial periodFree
  • Task Office Premium version$19.99
None

Erebus Solar

No in-app purchases

Questions

Is Task Office lite free?
Task Office lite is free to download, with in-app purchases available.
Is Erebus Solar free?
Erebus Solar is free to download, with no in-app purchases.
Which has better reviews, Task Office lite or Erebus Solar?
Task Office lite is rated higher. Task Office lite averages 4.0 out of 5 from 16 ratings, while Erebus Solar averages 3.7 from 3 ratings.
Do Task Office lite or Erebus Solar have ads?
Neither Task Office lite nor Erebus Solar shows ads.
Which is updated more often, Task Office lite or Erebus Solar?
Task Office lite ships an update every 3 weeks, and Erebus Solar every 2 weeks. Most recently, Task Office lite was updated on October 24, 2026 and Erebus Solar on October 14, 2026.

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