Comparison

Filters vs BlitzGTD

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

Head to head
About

Filters

This application assists in calculating electronic filter components for speaker systems. It automatically determines inductor and capacitor values based on desired impedance and cutoff frequency, and designs circuits for various speaker types. Users can visualize frequency and phase diagrams for their custom speaker designs.

Highlights
  • Automatic electronic component calculation
  • Frequency and phase diagram display (Bode plots)
  • Electronic circuit schema display
  • Support for various speaker types (high, mid, low, sub)
  • First and second-order filter design
  • Complete filter theory and formulas
Features
Read full description

"Filters" is an application for the calculation of electronic filters for the construction of speaker systems. The program automatically calculates the values of electronic components (inductors, capacitors) of electronic filters depending by the desired speaker impedance and the cutoff frequency. The software can calculate and design the circuits (filters) for high, medium, low, sub woofer, etc... first and second order. Once calculated the filter’s circuit the app will automatically design for You the frequency and phase diagrams (Bode plots). Build the speakers of your dreams with "Filters"! Features: - Automatic calculation of the electronic components of the filters for high, medium, low, sub woofers etc... - Display of frequency and phase diagrams (Bode plots) for the calculated values of the circuit’s electronic components - Display electronic circuit’s schema (filter) - Complete theory for formulas/circuits for all the filters implemented in "Filters"

About

BlitzGTD

Read full description

Are you weary of drowning in never-ending to-do lists and productivity tools that only add to the complexity? It is time to reclaim your time and energy with BlitzGTD, the ultimate personal productivity system designed to help you achieve more in less time! Forget about getting lost in convoluted methodologies and overwhelming task management. BlitzGTD takes the best principles from GTD (Getting Things Done) and supercharges them with a streamlined approach that will revolutionize the way you work. So, what sets BlitzGTD apart? Turbocharged Phases for Maximum Efficiency BlitzGTD introduces a powerful phased approach that aligns your tasks with modern agile methodologies: Today: Seize the Day Start every day fresh with the Today phase. Throw everything that comes your way in your Today list, keeping it short and focused. Prioritize, categorize, and handle tasks one by one. With BlitzGTD, you'll be in control, and tasks will flow smoothly from start to finish. Sprint: Accelerate Your Progress The Sprint phase is where you have tasks for the week. After completing your Today list, turn to the Sprint list for your next challenges. Keep it reasonable and stay on track towards your goals. Backlog: Fuel for the Future The Backlog phase is your treasure trove of ideas and tasks for future sprints. Store everything you want to tackle later. But don't let it become a graveyard! BlitzGTD keeps your Backlog active and tidy, ensuring you never lose sight of important tasks waiting for their time to shine. Archive: Remember Your Triumphs While others leave completed tasks in the dark, BlitzGTD celebrates your victories in the Archive phase. Preserve valuable information for years to come. You'll be amazed at how it aids recall and frees up mental space, especially when requests about past work come knocking. Schedule: Time Your Success For tasks with specific deadlines or time-sensitive requirements, the Schedule phase is your trusty ally. Pinpoint when tasks should be pushed to your Today list. Add reminders or set up recurring schedules effortlessly. Stay on top of your commitments with ease. Unleash Your Potential with Smart Planning BlitzGTD's planning events empower you to take charge of your day and week: Daily Event: Conquer Each Day Start your day with the Daily event. Once a day, dive into your calendar, Today, and Sprint lists. With a clear vision of what lies ahead, you'll arrange tasks strategically, ensuring a productive day ahead. No more aimless scrambling—BlitzGTD keeps you focused on what matters most. Weekly Event: Command Your Week Before each week unfolds, the Weekly event grants you the power to harness its potential fully. Take a dedicated moment to review your calendar, Sprint, and Backlog. Fine-tune your plan, ensuring a well-structured, intentional week. Say goodbye to overwhelm and hello to balanced productivity. BlitzGTD provides versatile features to tackle even the most complex tasks effortlessly: Simple hierarchy: Where Complexity Finds Clarity No more going into the rabbit hole. Tasks have Sub-Tasks and that's it. You work on a complex project? Yeah, that's the task. The detailed planning is done in the linked project planning tool, which does it the best. Embrace simplicity like never before, while keeping your workflow simple and organized. Tags: Context, Simplified Forget about rigid folders and categories. BlitzGTD embraces the power of tags as first-class citizens. Use 1-2 tags to add context and gain a holistic overview of your tasks. No more decision paralysis—simply tag and go! Attachments: Secure what is necessary Upload images or files that are part of the task to have everything in one place. No more searching for the screenshot! See https://blitzgtd.fa-krug.de/blitzgtd/ for an even deeper introduction. Also available on MacOS with full real-time sync! Attributions - https://hotpot.ai/ Legal Notice: https://blitzgtd-krug.de/legalnotice/

Screenshots

Filters4 screens
BlitzGTD4 screens

Verdict

The call

The clearest difference is price: BlitzGTD at Free against Filters's $0.99. BlitzGTD also leads on update cadence (every 4 days vs every 40 months) and device support (3 vs 1). Filters's advantage is in-app purchases (none vs 1). On ads 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

CostPrice · In-app purchases · Ads · Monetization

BlitzGTD is free to download; Filters costs $0.99 up front. BlitzGTD sells 1 one-off in-app purchase. Filters asks for nothing beyond the download.

UpkeepUpdate frequency

Filters ships an update every 40 months, BlitzGTD every 4 days. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.

Scorecard4 real differences · 6 level
Filters versus BlitzGTD: the parameters behind the verdict, then further details
ParameterFiltersBlitzGTD
Price$0.99Free — better
Rating3.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 40 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhoneiPhone, iPad, Mac — better
Requires iOS16.0 — better17.0
Further details — not scored
Size3 MB22 MB
Age rating4+4+
DeveloperGianluca NataliniSascha Krug

In-app purchases

None

Filters

No in-app purchases

1 purchases

BlitzGTD

One-time1
  • BlitzGTD Pro$5.99

Questions

Is Filters free?
Filters costs $0.99, with no in-app purchases.
Is BlitzGTD free?
BlitzGTD is free to download, with in-app purchases available.
Do Filters or BlitzGTD have ads?
Neither Filters nor BlitzGTD shows ads.
Which is updated more often, Filters or BlitzGTD?
Filters ships an update every 40 months, and BlitzGTD every 4 days. Most recently, Filters was updated on October 9, 2026 and BlitzGTD on October 19, 2026.

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