Recommendation
Use Leonardo AI as your primary Midjourney alternative for brand-consistent assets, and layer a lightweight prompt+asset version-control system on top. Leonardo gives the easiest “style lock” and seed reuse workflow in one place; use ChatGPT only for templating prompts and generating controlled prompt variants if you want programmatic prompt families.

Why this works
Leonardo supports explicit seeds, model/version locking, and repeatable style references. Combined with a structured prompt library, metadata export (prompt+seed+model+settings), and a simple asset-DAM or Git LFS workflow, you can reproduce exact frames across campaigns and hand off deterministic inputs to designers or automation.

Decision criteria (pick what matters most)
- Repeatability: must be able to fix seed + model/version + style reference. Leonardo fulfills this out of the box.
- Fidelity vs cost: higher fidelity (photorealism) may need different models; if budget is tight, prefer Leonardo for cost-to-control balance.
- Team size & governance: small teams can use shared docs; larger teams need a DAM and API-based automation.
- Integration: do you need Figma, CI/CD, or content scheduling? If yes, pick tools with APIs and webhooks.
- Legal/licensing: confirm usage and commercial rights before mass production.

Practical checklist (do this for each campaign)
1) Create a style spec: list colors (hex), fonts, composition rules, reference images. Save to a campaign folder.
2) Create an initial seed bank: generate 30+ candidates with Leonardo, tag the ones that fit. Record seed, prompt, model version, and settings in a CSV/Notion page.
3) Lock a canonical style: pick 1–3 reference images and lock the model/version in Leonardo. Save that model ref in the campaign spec.
4) Build prompt templates: create 3–5 templates (hero, product close-up, lifestyle). Use placeholders for variables (product, color, angle). Use ChatGPT to expand templates into controlled variations if helpful.
5) Name and export metadata with every image: filename like Campaign_Product_role_v001_seed12345_modelV2.jpg and alongside a JSON or text file containing the full prompt, seed, model, and settings.
6) Store masters in version control: commit prompts/JSON to Git (use Git LFS for binaries) or upload to your DAM (Brandfolder/Figma). Keep a CHANGELOG for prompt changes.
7) Batch generation and curation: generate in batches while keeping the seed and model constant for variants. Curate and mark winners with asset IDs.
8) Finalize and lock assets: export final PSD/PNG/TIFF, include color profile, and lock files in the DAM with metadata and usage guidelines.
9) Audit before campaign launch: verify seeds render identically by re-running 1–2 test prompts to ensure reproducibility.

Best-for / Avoid-if
- Best for: teams that need deterministic, repeatable outputs and want an integrated, cost-efficient image generator. Great when you need tight brand control and iterative campaigns.
- Avoid if: you require extreme, studio-grade photorealism or custom model training at scale—then consider on-prem or fine-tuned Stable Diffusion workflows (but that increases infra and tooling complexity).

Final notes
Start small: run a 1-week pilot (style spec + seed bank + one campaign folder). If reproducibility is successful, scale to a DAM + API automation. Use Leonardo’s locked-style and seed features as the baseline and ChatGPT only for prompt templating/variation generation when you need scale or consistent language.

Mentioned tools
Leonardo AI, ChatGPT

Recommendation CTA
Try Leonardo AI first to validate style-lock and seed workflows, then add a lightweight version-control layer (Git LFS or your DAM) to capture prompts, seeds, and model versions permanently.

Compare Leonardo AI and Midjourney