Best tools for blog and social thumbnails

Ranking at 100 images per month

1. 1FLUX (Black Forest Labs)Pay as you go planCheapest

   $3/mo

   ₩4,200

   The official API and playground from Black Forest Labs, the developer of the FLUX models. No subscription required: credits are deducted per generated image (by megapixel) on a pay-as-you-go basis.

   Includes 0 images, no free plan. Usage-based pricing with no subscription or seat fees (billed on generation volume only). Only the video tab was visible in this page text: FLUX 3 Video Draft HD $0.06/sec; FLUX 3 Video text/image-to-video HD $0.17, FHD $0.29, QHD $0.40, UHD $0.80/sec; video-to-video HD $0.41, FHD $0.53, QHD $0.65, UHD $0.95/sec (audio included, clips up to 20 seconds, rounded up to the nearest second). Per-image rates for FLUX.2/FLUX.1 were not shown in this text. Open-weight licenses (Builder 10,000 images/month, Platform 100,000 images/month, Professional 100,000 images/month) are listed without prices.

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2. 2Adobe FireflyFirefly Standard plan

   $9.99/mo

   ₩13,800

   Adobe's commercially safe generative AI service. Paid plans include unlimited image and vector generation with Firefly's own models, while video, audio, and partner models use generative credits.

   Includes Unlimited images, free plan Free available. Unlimited standard image and vector generation with Firefly's own models (Generate Image, Generative Fill, Expand). 2,000 generative credits/month cover video (up to 20 five-second clips), audio, and partner models (Google, OpenAI, FLUX). Annual discount price not stated on the official page.

   Get Adobe Firefly

3. 3MidjourneyBasic plan

   $10/mo

   ₩13,900

   The most well-known AI image generation service. Billing is based on GPU time; Standard and above include unlimited generations in the slower Relax mode.

   Includes 200 images, no free plan. 3.3 hours (200 minutes) of Fast GPU time per month ≈ about 200 images. No Relax mode. Video in SD only. Extra GPU time $4/hour.

   Get Midjourney

4. 4OpenArtStarter plan

   $14/mo

   ₩19,400

   An AI creator studio offering 100+ image and video models, character consistency, and story generation on a credit basis.

   Includes 4,000 credits, free plan Free available. 4,000 credits/mo ≈ up to about 4,000 images or about 50 videos (excluding Director). 8 concurrent generations, no watermark. Commercial use rights start at Plus. Priced per seat

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5. 5PlaygroundPro plan

   $15/mo

   ₩20,800

   A design-focused AI image generation service that offers free generation with its in-house PGv3 model, plus monthly credits for premium models such as Nano Banana, GPT Image, and Seedream.

   Includes 150 credits, free plan Free available. 150 premium model credits/month, 1 generation = 1 credit → up to 150 images (Nano Banana Pro costs 4 credits, up to 10 images). Separately, 75 PGv3 images per 3 hours. Unlimited premium templates, upscaling and background removal, 2K (2048×2048) editing, $144 with annual billing

   Get Playground

Excluded (not convertible): Canva Pro (Canva AI), Krea, Leonardo.Ai, NightCafe, Recraft. Credit cost varies by model with no official conversion.